The following news release was originally issued by SLAC National Accelerator Laboratory. The story describes how scientists at SLAC have shipped a miniature version of the digital camera they are building for the Large Synoptic Survey Telescope (LSST) to LSST headquarters in Tucson, Arizona. After further integration and testing, it will be installed next year for “first light” on the 8-meter LSST telescope on a mountaintop in Chile. Scientists at Brookhaven National Laboratory designed and constructed the raft—an array of nine state-of-the-art imaging sensors—for the miniature camera. Justine Haupt, an engineer at Brookhaven, also designed the cryostat that holds the raft in place, as well as its cooling system and additional internal mechanics. Brookhaven Lab is building all 21 rafts—a total of 189 sensors—for LSST’s full-sized camera. This 3,200 megapixel sensor array is nearly 200 times larger than a high-end consumer camera and, when it is combined with a massive supercomputer, it will enable scientists to create a time-lapse movie of the universe. For more information on Brookhaven’s role in LSST, visit www.bnl.gov/lsst.

A Miniature Camera for the Large Synoptic Survey Telescope Will Help Test the Observatory and Take First Images

SLAC completed its work on ComCam, a commissioning device to be installed in Chile later this year

June 20, 2019

By Aiko Takeuchi-Demirci

Members of the LSST Camera Integration and Testing team at SLAC have inserted a raft of nine imaging sensors into ComCam, a miniature version of the LSST camera that will soon be used for telescope commissioning. (Farrin Abbott/SLAC National Accelerator Laboratory)

Scientists at the Department of Energy’s SLAC National Accelerator Laboratory are building the world’s largest digital camera for astronomy and astrophysics – a minivan-sized 3,200-megapixel ‘eye’ of the future Large Synoptic Survey Telescope (LSST) that will enable unprecedented views of the universe starting in the fall of 2022 and provide new insights into dark energy and other cosmic mysteries. In the meantime, the lab has completed its work on a miniature version that will soon be used for testing the telescope and taking LSST’s first images of the night sky.

These images will include glimpses of the motions of asteroids and objects in our solar system with orbits beyond that of Neptune, as well as alerts of sudden events such as supernovae, exploding stars that temporarily light up parts of the sky.

The device, called ComCam (short for Commissioning Camera), will use only four percent of the full LSST camera’s focal plane and produce much smaller images, but it will provide enough “imaging power” to test the observatory while its ultimate camera is still under construction. In fact, ComCam’s 144 megapixels outnumber the pixel count that was available to the Sloan Digital Sky Survey, a pioneering astrophysical survey project in the early 2000s.

“ComCam will give us a great head start in checking all of the interfaces between the camera, telescope, site infrastructure and data management,” says Kevin Reil, LSST commissioning scientist and SLAC staff scientist.

After completing the integration of imaging sensors into ComCam and other tasks, the SLAC team today shipped the device to LSST headquarters in Tucson, Arizona. There, more components will be added before the finished ComCam is sent to its final destination in Chile later this year.

A miniature LSST camera

The extraordinarily high image quality of the full LSST camera will be largely due to its 189 state-of-the-art imaging sensors. Arranged into square arrays, called rafts, of nine sensors each, they’ll make up the camera’s focal plane. ComCam has only a single raft, which was provided by DOE’s Brookhaven National Laboratory and recently inserted into the ComCam cryostat at SLAC.

The cryostat, specially designed and built for ComCam, holds the raft in place and cools its imaging sensors to very low temperatures to eliminate unwanted background signals and improve image quality. The ComCam cryostat uses a different refrigeration system from that of the final LSST camera, which requires a more complex system in order to handle 21 rafts.

The raft also contains electronics boards that will digitize data taken with ComCam. These data will be sent to data management systems at the National Science Foundation-supported National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign and centers at France’s National Institute of Nuclear and Particle Physics and in Chile, where they will be analyzed by scientists around the world.

SLAC is also building and testing the camera control system, which will allow the observatory software to send commands to ComCam, for instance, to change filters and take images. The LSST camera will use the same control system.

Toward first images

Once ComCam arrives in Tucson, LSST scientists will add lenses, a filter changer and a shutter. They will integrate the complete instrument with the observatory software and computing infrastructure and perform crucial tests, including a dry run that will simulate a night of observations.

“In large projects like LSST, it’s exciting to watch the hardware and software come together into a working system over the years,” says Brian Stalder, LSST commissioning scientist in Tucson.

Finally, ComCam will be sent to Chile and installed on the actual telescope, paving the way for LSST commissioning.

In addition, it’ll produce LSST’s first images, albeit at a much smaller scale than the final camera. Although science studies won’t be ComCam’s primary purpose, the team expects the camera to produce images of very good quality, Reil says: “It’ll be exciting to see these early images taken with our brand new, world-class telescope.”

SLAC is a vibrant multiprogram laboratory that explores how the universe works at the biggest, smallest and fastest scales and invents powerful tools used by scientists around the globe. With research spanning particle physics, astrophysics and cosmology, materials, chemistry, bio and energy sciences and scientific computing, we help solve real-world problems and advance the interests of the nation.

The effort to build the LSST is a partnership between public and private organizations. Financial support for LSST Design and Development comes from the National Science Foundation, the Department of Energy Office of Science, and private funding raised by the LSST Corporation, a non-profit 501(c)3 corporation formed in 2003, with headquarters in Tucson, AZ. Contributions from private foundation gifts, grants to universities, and in-kind support from laboratories and other LSST Member Institutions were key to early construction and critical developments. The LSST Project Office for central management was established as an operating center under management of the Association of Universities for Research in Astronomy (AURA). The Department of Energy Office of Science funded effort is managed by the SLAC National Accelerator Laboratory (SLAC). Learn more at lsst.org.

SLAC is operated by Stanford University for the U.S. Department of Energy’s Office of Science. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States, and is working to address some of the most pressing challenges of our time. For more information, please visit energy.gov/science.

Brookhaven National Laboratory

Brookhaven National Laboratory is a multipurpose research
institution funded by the U.S. Department of Energy. Located on
Long Island, NY, Brookhaven operates large-scale facilities for
studies in physics, chemistry, biology, medicine, applied
science, and advanced technology. The Laboratory's almost 3,000
scientists, engineers, and support staff are joined each year by
more than 5,000 visiting researchers from around the world.

One of ten national laboratories overseen and primarily funded by the Office of Science of the
U.S. Department of Energy (DOE), Brookhaven National Laboratory conducts research in the physical,
biomedical, and environmental sciences, as well as in energy technologies and national security.
Brookhaven Lab also builds and operates major scientific facilities available to university, industry
and government researchers. Brookhaven is operated and managed for DOE's Office of Science by Brookhaven
Science Associates, a limited-liability company founded by the Research Foundation for the State
University of New York on behalf of Stony Brook University, the largest academic user of Laboratory
facilities, and Battelle, a nonprofit applied science and technology organization.